基于液晶的多层湍流大气成像过程模拟技术研究

项目名称： 基于液晶的多层湍流大气成像过程模拟技术研究

项目编号： No.U1531102

项目类型： 联合基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 刘永军

作者单位： 哈尔滨工程大学

项目金额： 45万元

中文摘要： 尽管配备了自适应光学技术和高分辨图像重建技术，但是由于湍流大气的存在天文望远镜依然不能完全消除湍流的干扰，使得高分辨率受到限制。项目旨在利用液晶相位调制技术设计具备非等晕性和时间相干效应的多层相位湍流模拟器及相关的光学系统，其功能是对入射光在不同位置进行相位调制，使之产生接近实际湍流大气扰动的波前相位，实现具有湍流大气干扰效应的成像过程，为自适应光学系统和高分辨图像重建技术的研究提供实验平台，使其提升自身性能进而提高天文望远镜的分辨率。研究内容涉及单层液晶湍流模拟器的研制、时间相干性研究、相位调制定标及其可靠性验证，同时进行了多层湍流大气的数值模拟研究。在此基础上，进行多层液晶模拟器的光学系统设计实现湍流大气的非等晕性及时间相干性，同时进行湍流大气成像过程模拟。

中文关键词： 大气湍流；液晶；非等晕性；时间相干性

英文摘要： Although equiped with adaptive optics technology and the high-resolution image reconstruction method, the disturbation can not be removed completely from the telescopes because of the existence of atmospheric turbulence, which limits their high resolution.We aim at applying liquid crystal phase modulation technology on designing a multi-layer phase turbulence modulator with anisoplanatism and temporal coherence and related optical systems, of which their function is to modulate the phase of incident beam on different locations, to produce a wavefront similar with real turbulent atmosphere, and to realise the imaging process with an effect of turbulent atmosphere, such that we provide an experimental platform for investigating the adaptive optics and the high-resolution image reconstruction to promote their own performances in order to improve the resolution of telescopes. Our research involves the development of single liquid crystal turbulence modulator, the investigation of temporal coherence, the calibration of phase modulation, and the verification of its reliability, as well as a numerical simulation of the turbulent atmosphere. On the basis of this, we design an optical system based on multiple liquid crystal modulators to realise the anisoplanatism and temporal coherence of the turbulent atmosphere, and a simulation of turbulent atmospheric imaging process.

英文关键词： Atmospheric Turbulence;Liquid Crystals;Anisoplanatism;Temporal Coherence